Radius-averaging instrument.



W. H. BRISTOL.

RADIUS AVERAGING INSTRUMENT.

APPLICATION FILED JULY 10, 1909.

Patented Nov. 2

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ecificaiion of Letters Pate Application n a short L1 record bf the tracer-e Wed. At the 0 pposite an L *ured.

ed. t 18 be averfw is mean onnding 5131i 22,

ing a vertical guidewa'y; a tracer-bar pass ing through said guideway and free to slide lengthwise therein; a support for said tracer-bar; an integrating wheel rotatable on said tracer-bar; and a tracing point carried by said tracer-bar and projecting downwardly therefrom.

2. In a radii averaging instrument: the combination with a suitable base provided with a socket; of a pin fitting said socket, rotatable therein and providing a vertical guideway guideway and free to slide lengthwise therein; a support for said tracer-bar; an integrating wheel rotatable on said tracer-bar;

and a tracing point carried by said tracerbar and projecting downwardly therefrom.

3. 'In a radii averaging instrument: the combination with a suitable base provided with a socket; of a vertically grooved pin fitting said socket and rotatable therein; a tracer-bar passing through the groove of said pin; a support for said tracer-bar; an integrating wheel rotatable on said tracerbar; a tracing point carried by said tracerbar and projecting downwardly therefrom.

4:- In a radii averaging instrument: the combination with a suitable base; of a guida tracer-bar passing through said an integrating season ing device free to rotate thereon and provid ing a vertical guideway; a tracer-bar passing through said guideway and free to slide lengthwise therein; a support for said tracer-bar; an integrating wheel rotatable on said tracer-bar, and a tracing point intermediate of said pin and said integrating wheel, carried by said tracer-bar and projecting downwardly. therefrom In a radii averaging instrument 1: the combination with a suitable base; of a guiding device free to rotate thereon and provid-' ing a'vertical guideway; a tracer-bar passing through said guideway and free to slide lengthwise therein; a forked support for said tracer-bar, terminating in linger pieces wheel rotatable on sai tracer-bar; and a tracing point carried by said tracer-bar and projecting downwardly therefrom.

Signed at New York in the county of New' York and State of New York this 9th day of LLIAM H. BRISTOL.

' Witnesses: V 1 LAURA E. SMITH, Saturn 0. Ynnorznzr. 

